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REM sleep typically occupies 20â25% of total sleep in adult humans: about 90â120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep. Cycles of about 90 minutes each follow, with each cycle including a larger proportion of REM sleep.
REM sleep usually occurs in cycles during the last 5-6 hours of an 8-hour night's sleep. So how much sleep we get in this stage will depend on how much sleep we get for the niâ¦ght. During REM sleep, eye movements increase, heart rate increases, and the normal body processes also increase.